Exim mail bounce back – retry time not reached for any host after a long failure period

I’ve recently come across the following Exim error when sending emails to specific domains:

T=remote_smtp: retry time not reached for any host after a long failure period

The first thing I did was to check that there was nothing wrong with the resolver on my server and ran a few DNS lookups from my server to the recipient’s domain.

Once I was sure that both the resolver and the recipient’s DNS were all correct, I had to do the following:

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01 – Go to: /var/spool/exim/db

cd /var/spool/exim/db

02: Delete these files:

rm retry retry.lockfile wait-remote_smtp wait-remote_smtp.lockfile

03: Then restart your Exim service:

service exim restart

After that you should be able to send emails to the domain in question as normal.